thib8956/test-canvas
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small refactor and reformat

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Thibaud Gasser 2024-09-23 22:27:18 +02:00
parent 9dd3b6487a
commit 8c9ad7fdc3
1 changed files with 46 additions and 65 deletions
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99
main.js
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@ -1,45 +1,26 @@
function drawCross(ctx, hue) {
ctx.beginPath();
ctx.moveTo(200, 200);
ctx.lineTo(300, 300);
ctx.moveTo(300, 200);
ctx.lineTo(200, 300);
ctx.lineWidth = 5;
ctx.strokeStyle = `hsla(${hue}, 100%, 50%, 1)`;
ctx.stroke();
}
function drawCircle(ctx) {
ctx.beginPath();
// arc(x, y, radius, startAngle, endAngle)
ctx.arc(75, 75, 50, 0, Math.PI * 2);
ctx.stroke();
}
let startTime = undefined;
let shapes = [];
let pendingClicks = [];
function animate(ctx, time) {
if (!startTime) {
function update(ctx, time) {
if (!startTime) {
startTime = time;
}
for (const evt of pendingClicks) {
const h = Math.floor(Math.random() * 255);
if (evt.kind == "circle") {
shapes.push({kind: evt.kind, x: evt.x, y: evt.y, t: time, hue: h});
} else if (evt.kind == "cross") {
shapes.push({kind: evt.kind, x: evt.x, y: evt.y, t: time, hue: h});
}
}
pendingClicks = [];
for (const evt of pendingClicks) {
const h = Math.floor(Math.random() * 255);
if (evt.kind == "circle") {
shapes.push({kind: evt.kind, x: evt.x, y: evt.y, t: time, hue: h});
} else if (evt.kind == "cross") {
shapes.push({kind: evt.kind, x: evt.x, y: evt.y, t: time, hue: h});
}
}
pendingClicks = [];
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
for (const shape of shapes) {
const dt = time - shape.t;
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
for (const shape of shapes) {
const dt = time - shape.t;
switch (shape.kind) {
case "circle":
drawAnimatedCircle(ctx, dt, shape.x, shape.y, shape.hue);
@ -48,19 +29,19 @@ function animate(ctx, time) {
drawAnimatedCross(ctx, dt, shape.x, shape.y, shape.hue);
break;
}
}
}
window.requestAnimationFrame(time => animate(ctx, time));
window.requestAnimationFrame(time => update(ctx, time));
}
function drawAnimatedCircle(ctx, dt, x, y, hue) {
const end = dt*2*Math.PI/500;
ctx.save();
const end = dt*2*Math.PI/500;
ctx.save();
ctx.beginPath();
ctx.arc(x, y, 50, 0, Math.min(end, 2*Math.PI));
const percent = Math.trunc(100*Math.min(end, 2*Math.PI)/(2*Math.PI));
ctx.strokeStyle = `hsla(${hue}, ${percent}%, 50%, 1)`;
ctx.lineWidth = 5;
const percent = Math.trunc(100*Math.min(end, 2*Math.PI)/(2*Math.PI));
ctx.strokeStyle = `hsla(${hue}, ${percent}%, 50%, 1)`;
ctx.lineWidth = 5;
ctx.stroke();
ctx.restore();
}
@ -82,36 +63,36 @@ function drawAnimatedCross(ctx, dt, x, y, hue) {
}
ctx.lineWidth = 5;
const percent = Math.trunc(100*Math.min(delta, 100)/100);
ctx.strokeStyle = `hsla(${hue}, ${percent}%, 50%, 1)`;
const percent = Math.trunc(100*Math.min(delta, 100)/100);
ctx.strokeStyle = `hsla(${hue}, ${percent}%, 50%, 1)`;
ctx.stroke();
}
function resizeCanvas(ctx) {
ctx.canvas.width = window.innerWidth;
ctx.canvas.height = window.innerHeight;
ctx.canvas.width = window.innerWidth;
ctx.canvas.height = window.innerHeight;
}
function init() {
const canvas = document.getElementById("canvas");
if (canvas.getContext) {
const ctx = canvas.getContext("2d");
resizeCanvas(ctx); // Init canvas
if (canvas.getContext) {
const ctx = canvas.getContext("2d");
resizeCanvas(ctx); // Init canvas
window.addEventListener('resize', () => resizeCanvas(ctx));
window.requestAnimationFrame(time => animate(ctx, time))
canvas.addEventListener("click", (evt) => {
const {clientX, clientY} = evt;
pendingClicks.push({x: clientX, y: clientY, kind: "circle"});
});
canvas.addEventListener("click", (evt) => {
const {clientX, clientY} = evt;
pendingClicks.push({x: clientX, y: clientY, kind: "circle"});
});
canvas.addEventListener("contextmenu", (evt) => {
evt.preventDefault();
const {clientX, clientY} = evt;
pendingClicks.push({x: clientX, y: clientY, kind: "cross"});
});
canvas.addEventListener("contextmenu", (evt) => {
evt.preventDefault();
const {clientX, clientY} = evt;
pendingClicks.push({x: clientX, y: clientY, kind: "cross"});
});
}
window.addEventListener('resize', () => resizeCanvas(ctx));
window.requestAnimationFrame(time => update(ctx, time))
}
}
init();